A network monitor is used to determine resource (e.g., CPU, memory, storage, or network) utilization of one or more virtual machines on one or more corresponding servers. Using resource utilization data for an original configuration of the virtual machines on the servers, the described system and methods simulate reconfigurations of various VMs on servers, determines resource utilization of the simulated reconfigurations, and proposes a reconfiguration that results in lower resource utilization across the one or more corresponding servers.